Average annual temperature is 21.6 °C
Absolute maximum temperature: 42.7 °C
Absolute minimum temperature: 0.5 °C
Number of sunny days: 167 days
Number of rainy days: 198 days
Look at detailed online map of Rock Island
* Weather data for Rock Island United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 24.9 | 27.3 | 29.3 | 31.0 | 31.8 | 38.2 | 38.5 | 42.7 | 40.7 | 34.8 | 30.0 | 26.3 |
| Average daytime temperature (°C) | 18.3 | 19.5 | 23.6 | 24.4 | 28.1 | 34.3 | 36.4 | 39.3 | 34.7 | 27.8 | 20.9 | 19.3 |
| Average temperature (°C) | 13.3 | 13.7 | 18.1 | 18.8 | 23.2 | 28.2 | 30.6 | 32.6 | 28.8 | 22.0 | 15.7 | 13.2 |
| Average night temperature (°C) | 9.7 | 9.7 | 14.0 | 14.7 | 19.2 | 23.4 | 25.4 | 26.7 | 24.0 | 17.6 | 11.8 | 8.5 |
| Absolute minimum temperature (°C) | 0.6 | 0.5 | 3.8 | 9.5 | 11.8 | 19.2 | 23.0 | 23.7 | 19.9 | 6.6 | 3.4 | 0.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 12.9 | 13.7 | 14.1 | 13.9 | 13.2 | 12.3 | 11.4 | 10.6 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 6.3 | 6.8 | 7.8 | 7.7 | 9.0 | 11.8 | 12.4 | 12.1 | 10.7 | 8.2 | 6.6 | 8.1 |
| Precipitation (mm) | 131 | 39 | 67 | 174 | 208 | 64 | 25 | 2 | 72 | 86 | 64 | 44 |
| Sunny days | 14 | 11 | 9 | 6 | 6 | 13 | 21 | 23 | 15 | 16 | 14 | 19 |
| Rainy days | 17 | 17 | 22 | 24 | 25 | 17 | 10 | 8 | 15 | 15 | 16 | 12 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Rock Island during the most sunny months:
The largest precipitation sum in Rock Island is at